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Vaginal infections are a very common cause for the pH of the vagina to rise. The most common vaginal infection in my practice (and in all doctor's offices) is Bacterial Vaginosis which causes the normal vaginal pH to rise to above 4.5. Odor usually occurs with Bacterial Vaginosis.
1 Tampons: Since they retain the fluids that cause pH to increase, tampons can contribute to the problem, especially if you âforgetâ a tampon and leave it in too long. 2  Intercourse: The pH of semen is 7.1 to 8. 3  Douching and cleansers: Any vaginal infusion of water or other fluids can affect vaginal pH.